use crate::snark::marlin::ahp::matrices::{make_matrices_square, padded_matrix_dim, to_matrix_helper};
use snarkvm_fields::Field;
use snarkvm_r1cs::{errors::SynthesisError, ConstraintSystem as CS, Index as VarIndex, LinearCombination, Variable};
use snarkvm_utilities::serialize::*;
pub(crate) struct ConstraintSystem<F: Field> {
pub(crate) a: Vec<Vec<(F, VarIndex)>>,
pub(crate) b: Vec<Vec<(F, VarIndex)>>,
pub(crate) c: Vec<Vec<(F, VarIndex)>>,
pub(crate) num_public_variables: usize,
pub(crate) num_private_variables: usize,
pub(crate) num_constraints: usize,
}
impl<F: Field> ConstraintSystem<F> {
#[inline]
pub(crate) fn new() -> Self {
Self {
a: Vec::new(),
b: Vec::new(),
c: Vec::new(),
num_public_variables: 1,
num_private_variables: 0,
num_constraints: 0,
}
}
#[inline]
pub(crate) fn a_matrix(&self) -> Vec<Vec<(F, usize)>> {
to_matrix_helper(&self.a, self.num_public_variables)
}
#[inline]
pub(crate) fn b_matrix(&self) -> Vec<Vec<(F, usize)>> {
to_matrix_helper(&self.b, self.num_public_variables)
}
#[inline]
pub(crate) fn c_matrix(&self) -> Vec<Vec<(F, usize)>> {
to_matrix_helper(&self.c, self.num_public_variables)
}
#[inline]
pub(crate) fn make_matrices_square(&mut self) {
let num_variables = self.num_public_variables + self.num_private_variables;
let matrix_dim = padded_matrix_dim(num_variables, self.num_constraints);
make_matrices_square(self, num_variables);
assert_eq!(self.num_public_variables + self.num_private_variables, self.num_constraints, "padding failed!");
assert_eq!(
self.num_public_variables + self.num_private_variables,
matrix_dim,
"padding does not result in expected matrix size!"
);
}
#[inline]
fn make_row(l: &LinearCombination<F>) -> Vec<(F, VarIndex)> {
l.as_ref().iter().map(|(var, coeff)| (*coeff, var.get_unchecked())).collect()
}
}
impl<F: Field> CS<F> for ConstraintSystem<F> {
type Root = Self;
#[inline]
fn alloc<Fn, A, AR>(&mut self, _: A, _: Fn) -> Result<Variable, SynthesisError>
where
Fn: FnOnce() -> Result<F, SynthesisError>,
A: FnOnce() -> AR,
AR: AsRef<str>,
{
let index = self.num_private_variables;
self.num_private_variables += 1;
Ok(Variable::new_unchecked(VarIndex::Private(index)))
}
#[inline]
fn alloc_input<Fn, A, AR>(&mut self, _: A, _: Fn) -> Result<Variable, SynthesisError>
where
Fn: FnOnce() -> Result<F, SynthesisError>,
A: FnOnce() -> AR,
AR: AsRef<str>,
{
let index = self.num_public_variables;
self.num_public_variables += 1;
Ok(Variable::new_unchecked(VarIndex::Public(index)))
}
fn enforce<A, AR, LA, LB, LC>(&mut self, _: A, a: LA, b: LB, c: LC)
where
A: FnOnce() -> AR,
AR: AsRef<str>,
LA: FnOnce(LinearCombination<F>) -> LinearCombination<F>,
LB: FnOnce(LinearCombination<F>) -> LinearCombination<F>,
LC: FnOnce(LinearCombination<F>) -> LinearCombination<F>,
{
self.a.push(Self::make_row(&a(LinearCombination::zero())));
self.b.push(Self::make_row(&b(LinearCombination::zero())));
self.c.push(Self::make_row(&c(LinearCombination::zero())));
self.num_constraints += 1;
}
fn push_namespace<NR, N>(&mut self, _: N)
where
NR: AsRef<str>,
N: FnOnce() -> NR,
{
}
fn pop_namespace(&mut self) {
}
fn get_root(&mut self) -> &mut Self::Root {
self
}
fn num_constraints(&self) -> usize {
self.num_constraints
}
fn num_public_variables(&self) -> usize {
self.num_public_variables
}
fn num_private_variables(&self) -> usize {
self.num_private_variables
}
fn is_in_setup_mode(&self) -> bool {
true
}
}